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Copyleft works can be shared both in original form and after being adapted, but they must remain under the copyleft licence even if they are modified.

Copyleft licences are also called 'reciprocal', 'viral' and 'share alike' libre licences. However, whereas copyleft can only describe a libre work, the other three terms can also describe proprietary works that must be kept under the same (proprietary) licence when adapted.

Works

100/3 RPG ● 'A percentile RPG on a single page where player characters consist of 3 attributes (Violence, Elegance and Intelligence), a profession, a one-sentenced description of their wishes and weaknesses and two hit points (body and insanity).'

13th Age ● 'This is the home of the 13th Age / Archmage Engine system reference document. It contains all the open content from the 13th Age RPG – the Archmage Engine.'

2013 Open Source Calendar ● 'Featuring all your favourite Open Source Heroes and Heroines, these are some of the people who have done most to exemplify or further the cause of a more open, collaborative or more freedom-conscious approach to working, thinking and licensing.'

Achieving Impossible Things ● 'Six "impossible things": GNU/Linux, Wikipedia, the Creative Commons, the Blender Foundation, Open Hardware, and the OLPC/Sugar project. All created under free licenses for everyone to use, in defiance of our conventional ideas of business economics. Is it magic, coincidence, or just plain common sense at work here?'

Action! System ● "The Action! System Core Rules provide all of the basic rules necessary to create and play a role-playing game. Create adventures and characters based on your favorite movies, TV shows or novels."

Adventurer Conquerer King System ● 'Autarch's Adventurer Conqueror King System fulfills the promise of the original fantasy role-playing game by providing comprehensive, integrated support for play across all levels of a campaign.'

Arcemu ● Arcemu is an MMORPG server framework project which currently supports World of Warcraft 3.3.5a

Army Brats ● "Welcome to Fort Biloxi. Your parents have sent you to military school to "help you focus". What could be scarier than military school? How about being one of the new kids? Luckily, you have a cunning plan. You and the other new kids (the other players) are going to try to get expelled so you can go back to public school with all your friends."

Balloon Mapping Kit ● 'Once assembled, this kit -- developed by community researchers from the Public Laboratory for Open Technology and Science -- enables you to collect your own aerial photos from up to 1000 ft.'

Battle for Wesnoth ● 'The Battle for Wesnoth is a Free, turn-based tactical strategy game with a high fantasy theme, featuring both single-player, and online/hotseat multiplayer combat.'

Beast Hunters ● Tattooed hunters of beasts use their fiendish blood for sorcery.

Big Island ● A game where you protect island inhabitants from skeletons.

Biodigital ● 'Biodigital is a novel, first published as an Ebook via Unglue.it, about a Silicon Valley tech genius/messiah and the quasi-religious cult of transhumanist computer designers and brain hackers who follow him.'

Code ● 'cyberspace has no “nature.” It only has code-the software and hardware that make cyberspace what it is. That code can create a place of freedom-as the original architecture of the Net did-or a place of oppressive control. '

CERN Open Hardware License ● 'In the spirit of knowledge sharing and dissemination, the CERN Open Hardware Licence (CERN OHL) governs the use, copying, modification and distribution of hardware design documentation, and the manufacture and distribution of products.'